open-coder-ai/block-invisible-unicode

{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "block-invisible-unicode",
  "version": "0.0.1",
  "description": "Pre-commit gate for the mechanizable slice of prompt-injection defense: invisible and direction-override Unicode in staged changes. Bidi controls make code read differently than it parses (Trojan Source, CVE-2021-42574); Unicode tag-block characters smuggle instructions that are invisible to a human reviewer but fully legible to the agent reading the file. Zero-width joiners and bidi marks (ZWJ/ZWNJ/LRM/RLM) are deliberately NOT matched -- they are legitimate in emoji sequences and in Persian, Arabic and Indic text -- so ordinary internationalised content passes; only the override/embed/isolate controls and the tag block, which have no honest use in a source tree, are blocked. Escape: 'pragma: allowlist invisible-unicode' on the same line.",
  "author": {
    "name": "chock-core"
  },
  "repository": "https://github.com/open-coder-ai/chock-catalog",
  "license": "Apache-2.0",
  "keywords": [
    "chock",
    "policy-as-code",
    "hook",
    "block",
    "{'control': 'asi01', 'coverage': 'partial', 'note': 'blocks the hidden-character slice of goal-hijack payloads a diff can show; semantic injection defense remains advisory (injection-defense, owasp-asi01-agent-goal-hijack)'}"
  ],
  "extensions": {
    "io.github.open-coder-ai": {
      "manifest": "manifest.yaml",
      "artifact": "hook",
      "enforcement": "block",
      "coverage_without_chock": "advisory"
    }
  }
}